Mold for concrete wall blocks



March 23 1926.

H. T. BUMGARDNER MOLD FOR CONCRETE WALL BLOCKS Illlfllnflvvlllnlz FilexLJan. 4, 1926 2 Sheets-Sheet Inventor 21B wff/adr/'Ya/z;

ztorfzey Filed Jan. 4. 1926 H T BUMGARDNER MOLD FOR CONCRETE WALL BLOCKS March 23 1926,

Patented Mar. 23, 1926.

i UNITED stares HARRYT. B'UMGARDNER, OF WAGO, TEXAS.l

MOLD non ooNcnnfrnwALnBtooKs. c

l Application ined January 4, 192e. serial No. 79,166.

T all who-m t may concern.' y t Be it known that I, HARRY T. BUMGARD- man, a citizen of the United States, residing at 1Waco, in the county of McLennan and h State of Texas, have invented certain new and useful Improvements in a Mold for Concrete fall Blocks, of which thefollow ving is a specification.

This invention relates to concrete Vwall I0 blocks, but has more particular reference to a mold construction for forming the saine, the primary object of the invention residing in the provision of a relatively simple, but efficient form of mold wherein a plurality of `blocks may be simultaneously formed, and this without requiring any great ski-ll upon the part of the workmen.

A further and important object is to provide a mold construction wherein a plurality of wall blocks of the tongue and groove type may be formed through use of but a single mold construction. y A further and important object is to providea mold construction wherein the shape of the interlocking tongues and grooves may be varied through reason ofthe provision of interchangeable molding plates.

A still further and important Objectis to provide a mold construction wherein a facing may be formed upon the block during the formation of the same within the mold.

Other objects will become apparent as the invention will be better understood, the same comprising the novel construction, combination and arrangement of parts hereinafter more fully described, shown inthe accompanying drawing,and claimed.

In the drawings wherein likev reference characters indicate corresponding` paris throughout the several views: Y

Figure l is a fragmentary top plan of a mold constructed in accordance 'with the present invention, the top block forming plate being partly broken away for obvious reasons, the mold being disclosed as in actual use.

Figure 2 is a detail transverse Lsection taken substantially upon the line 2-2 of Figure l, disclosing the mold in useprior to the block facing pouring operation.

block,

y edges Figure 3 is a perspective of theforrned Figure et is a section similar-to Figure 2,.'

in this instance however, there has been poured into the mold a batch of facing material, it being ofcourse necessary that the. mold be constructed with a removable face plate in order that after the blocks have be` of course that the bottoms and end facing plates be constructed complementary to the top face plate. i

Now having particular reference to the drawing, vindicates the mold box of suitable material, preferably wood, that is generally square in cross section, and open at its top side Said mold box is of relatively great length, and 1n the construction of blocks in the type shown 1n Figure 3, is

'adapted to have removably disposed upon its bottoni-wall, a block bottom face plate- 6 o f Vsheet metal.v Saidbottom face plate 6 is formed adjacent its oppositevlongitudinal with pendent V-shaped channels T-f, the bottoni walls -of which rest upon the bottom of the box` 5, as clearly shown in Figures 2 and a. For 4preventing sagging of the central portion of this face plate and the longitudinal edges thereof filler strips 8 and 49--9 respectively are provided. The mold construction further constitutes the provision of a plurality of rectangular shaped block vertical air shape. forming boxings 10 that are adapted to be vertically disposed iii-predetermined spaced relation within the center of the niold box 5 as clearly shown in Figures l, 2 and at. n

The inner surfaces of, the boX side walls `are provided at predetermined spaced points with registering vertical slots ll-ll within which slidably engage the opposite vertical edges of block end forming plates l2.

= These plates are also formed adjacent their soA y ioo opposite vertical edges with vertically extending V-shaped channels 12S-13 for providing the formed blocks with interlocking tongues and grooves at their adjacent ends.

The mold construction further constitutes the provision of aplurality of blockfacing strips 14, Figure 2, that are disposed within the mold block intermediate the end strips 12 and inv face to face contact with the interior surface of the boX front wall.

lThe facing strips 6, 12, and 14 are all of a smooth surfaced metal, as isA also the air space forming boxings 10 in order that the resultant blocksV will be provided with smooth faces. After these strips and boxingshave been so disposed within the mold box 5,' the material is formed and allowed to harden for producing blocks 15 of the coustruction more clearlyshown in Figures l and As shown in these figures, the blocks 15 will be of substantially rectangular shape, and will be piovided with a single vertical air channel 1G, the upper and one side edge thereof being formed with relatively V- shaped grooves 1T and 1S respectively, at

i opposite sides of the air 'space i'vhereasl the lower 'side and opposite end of the block will be provided with V-shaped tongues 19 and 20, respectively, it being obvious that when the blocks are laid, the tongues and grooves of adjacent blocks will intert for 'providing an interlocking means between adjacent blocks.

It is of course to be understood that after the semi-fluid mass has been poured into the mold box .5, the top faciiig strip 21 is forced downwardly by pressure upon the top of the mold the same being provided adjacent its opposite end with pendent V-shaped channels QQQQQ, Fignres land 2.

The forward longitudinal edge of the top strip 21 is reduced in width with respect to the other longitudinal edge of the strip in order that the front facingstrips 14--14 Y may be removed after the blocks have partially hardened.

After said blocks have partially hardened, these strips are removed and relatively thinner strips 14 are inserted in lieu thereof, after 'which a facing material 23, Figure It, may be poured between the blocks and said strips 14 for providing a smooth and artistic facing for the block.

In Figure 6 there is shown a slightly modified form of top, bottom, and end' facing lstrip 24, that is similar to the strips 6` 12and 21 respectively, shown in Figures 1 2, l, and 5 with the exception that the tongue and groove forming channels 25e-25 of relatively W-shape for forming a dual tongue and groove connection between the topf, bottom, and ends of the block, one of which 'is fragmentarily 'shown in Figure 7, and designated 26.

i It will thus be seen that I have provided a highly novel, simple and inexpensive mold construction whereby a plurality of novel wall blocks may be rapidly formed without the requirement of a separate mold construction for each block, and ofsuch a nature as topermit of the ready disassemblage of parts for cleaning or renewal pur' poses, and in order that various designed top, bottom, and end facing strips may be employed.

Minor changes may be made in the invention withoutdeparting from the spirit and scope of the appended claims.

Having thus described the invention, what I claim'as new and desire to secure by Letters Patent is: v y

1. In a block forming mold of the character described, a relatively elongated mold box being open'atits top side, a block bottom facing strip adapted to bc disposed within the box and for restupon the bottom wall thereof, said strip being formed adjacent its opposite longitudinal edges with pendent channels, filler blocks disposed within the box beneath the bottom facing strips at the opposite sides of the pendent channels, predetermined spaced block end forming strips removably, and verticallydisposed within the mold box, said end forming strips being provided adj acent their opposite edges with vertical channels, and a block top facing forming strip adapted to be disposed upon'the mold box after the material hasbeen poured therein, said last meir tioned strip being also provided adjacent its opposite longitudinal edges with pendent channels, the channels of all of said forming strips adaptedl to provide interlocking tongues and groovesupon the bottom and top, and opposite vends respectively of the lock.

2. In a block forming mold of the character described, a relatively elongated mold box being open at its top side, a block bottom facing strip adapted to be disposed within the box and for rest upon the bottoni wall thereof, said strip being formed adjacent its opposite longitudinal edges with pendent channels, filler blocks disposed within'the box beneath the bottom facing strips at the opposite sides of the pendent channels, predetermined spacing block end forming strips removably and vertically disposed within the mold box, said end forming vstrips being provided adjacenttheir opposite edges with vertical channels, and a block bleek, and interchangeable bleek iront face foi'miiigg; strips of \f'mying thickness for removable positioning within the box intermediate the end facing sti-ip und upon the iiiiiei' Side of the box freut Wall whereby, zitter the blocks being 'formed Within the meld have partially hardened, the thick strips .may be removed and the thin strips inserted in lieu thereof for providing e facing material ieeeivng Space between the 10 bleek and Said facing strip.

In testimony Wheieo'f I afiix my signature,

HARRY T. BUMG-ARDNER. 

